CUCM 8.6 Integration to Nortel CS2100 SE16

Hey All,
Previously we had integration to a Nortel CS2100 working great via a SIP trunk.
Recently we had to upgrade the Nortel to SE16 and since then I have been having an issue with the following call flow.
1. Call originates from Cisco IP(SIP) phone to a Nortel TDM phone over the SIP trunk and if that TDM phone hunts to VM I get dead air for 11 seconds then the call drops. If the TDM phone is hard forwarded into VM then their is no issue, it is only when it hunts.
- I mentioned Cisco IP(SIP) above because it does not drop if it is from a SCCP phone like a 7925 WIFI phone or a soft client like IP communicator or even the SIP trunk I have for Microsoft Lync.
In looking at logs on RTMT I am now seeing re-invite inside a re-invite error(in red below) messages which you can see in the screenshot below (sorry for the blackout but infosec policy required it) . Anyone have any ideas? I do have a TAC case open but I am really trying to get this fixed before everyone comes back from the holiday.

Just wanted to update everyone on here with the details I found in the traces. CUCM was doing Early Offer to the Nortel side and the 200OK from Nortel still had 2 codecs listed rather than one causing CUCM to immediately Re-Invite with G./711ulaw only. It looks like the Nortel system doesn't know how to handle inbound early offer. Solution will be to turn off Early Offer on the CUCM SIP Profile.

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*Sep 19 20:26:31.213: ISDN Se0/0/0:23 Q931: Sending SETUP callref = 0x542A callID = 0xD3B3 switch = primary-qsig interface = Network
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                Standard = CCITT
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Have you had any luck solving this issue?
I am having the exact same problem. What I have found is that the local provider is saying that the number is not coming across in E.164 format which then appears to them as an unknown number so they just append either the main phone number to the caller ID or sometimes the phone number associated with billing contact. The nortel works just fine in both senarios, but there seems to be something lost in translation between the Cisco and Nortel.   So far I haven't been able to find a setting to fix this.

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I have a weird Unity Connection Voice Mail issue and would appriciate any help i can get. Many thanks in advance.
I have Unity connection 7.0 and CUCM 7.0 integrated in a lab enviroment and here is what happens.
When I place a call internally say from 2001 to 2002, things work as expected, 2002 rings and it goes to voicemail where I can leave voicemail and listen to it from 2002.
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I have run out of ideas...
===============================
Here is a call trace from an internal call:
CallData, 1, CallerId=2003, CalledId=2002, RedirectingId=2002, Origin=16, Reason=4, CallGuid=8B7859FD6C16417A9A07F507418DD25B, CallerName=, LastRedirectingId=2002, LastRedirectingReason=4, PortDisplayName=PhoneSystem-1-001
Application, 1, 2003, AttemptForward
State, 1, 2003, State - AttemptForward.cde!Dummy
State, 1, 2003, Event is [NULL]
Application, 1, 2003, PHTransfer
State, 1, 2003, State - PHTransfer.cde!LoadInfo
State, 1, 2003, Event is [TrueEvent]
Application, 1, 2003, PHGreeting
State, 1, 2003, State - PHGreeting.cde!PlayGreeting
Display, 1, 2003, Call answered if needed
Display, 1, 2003, Playing greeting for Subscriber: hq2
Display, 1, 2003, No DTMF received
Display, 1, 2003, Playing greeting for Subscriber: hq2
State, 1, 2003, Event is [RecordMsgEvent]
State, 1, 2003, State - PHGreeting.cde!RecordMsg
State, 1, 2003, Event is [NULL]
State, 1, 2003, State - PHGreeting.cde!RunEditMsg
Application, 1, 2003, -->MessageEditing
State, 1, 2003, State - MessageEditing.cde!CheckMsgMenuOpt
State, 1, 2003, Event is [EditMessageMenuEvent]
State, 1, 2003, State - MessageEditing.cde!PlayEditMenu
State, 1, 2003, Event is [HangupEvent]
State, 1, 2003, State - MessageEditing.cde!CheckMsgLength
State, 1, 2003, Event is [ManyEvent]
State, 1, 2003, State - MessageEditing.cde!SendMsg
State, 1, 2003, Event is [TrueEvent]
State, 1, 2003, State - MessageEditing.cde!ConfirmSend
State, 1, 2003, Event is [HangupEvent]
Application, 1, 2003, <--MessageEditing
State, 1, 2003, Event is [HangupEvent]
Display, 1, 2003, Idle
Display, 1, , Dialing (MWI) '2002'
Display, 1, , Idle
and here is a trace from an external (PSTN) call
Trying 142.100.64.13, 5000 ... Open
CallData, 1, CallerId=911, CalledId=2002, RedirectingId=2002, Origin=16, Reason=4, CallGuid=CA3DFD90846C4FE7B0D68298A7698287, CallerName=PSTN Emergency, LastRedirectingId=2002, LastRedirectingReason=4, PortDisplayName=PhoneSystem-1-001
Application, 1, 911, AttemptForward
State, 1, 911, State - AttemptForward.cde!Dummy
State, 1, 911, Event is [NULL]
Application, 1, 911, PHTransfer
State, 1, 911, State - PHTransfer.cde!LoadInfo
State, 1, 911, Event is [TrueEvent]
Application, 1, 911, PHGreeting
State, 1, 911, State - PHGreeting.cde!PlayGreeting
Display, 1, 911, Call answered if needed
Display, 1, 911, Playing greeting for Subscriber: hq2
Display, 1, 911, No DTMF received
Display, 1, 911, Playing greeting for Subscriber: hq2
State, 1, 911, Event is [RecordMsgEvent]
State, 1, 911, State - PHGreeting.cde!RecordMsg
State, 1, 911, Event is [NULL]
State, 1, 911, State - PHGreeting.cde!RunEditMsg
Application, 1, 911, -->MessageEditing
State, 1, 911, State - MessageEditing.cde!CheckMsgMenuOpt
State, 1, 911, Event is [EditMessageMenuEvent]
State, 1, 911, State - MessageEditing.cde!PlayEditMenu
State, 1, 911, Event is [HangupEvent]
State, 1, 911, State - MessageEditing.cde!CheckMsgLength
State, 1, 911, Event is [NULL]
Application, 1, 911, <--MessageEditing
State, 1, 911, Event is [NULL]
State, 1, 911, State - PHGreeting.cde!AfterMsg
State, 1, 911, Event is [NULL]
Display, 1, 911, Idle

Sounds like one way audio from PSTN to your Unity Connection, couple of things to check:
1. ensure your protocols are bound properly on the GW, i.e. SIP/H323/MGCP
2. Make sure IP routing is OK between Unity and the voice gateway
HTH,
Chris

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